My friend and I were meant to go to the Wembley show tomorrow, Wednesday 17th (VIP so early entry) but I tested positive for COVID this morning so can't go anymore... If anyone is willing to pay face value I'd be very glad to put you in touch with her!
I'm finally able give an answer to my observation. The track is either Humankind or Infinity Sign or their common ancestor Life Is Beautiful. It uses the same modulated guitar effects, I mean identical. Gives us a hint at MOTS creation.